Azure位置大小写不一致：vm list与location list命令输出差异

Hey, I've run into this exact issue before! It's super frustrating when you're scripting or trying to match region names across different Azure CLI commands, right? Let me break down what's going on and how to handle it.

The Problem #

The core issue is that the Azure ARM API and certain CLI commands return region names with inconsistent casing, especially for newer regions:

• When you run azure location list, regions like Canada East show up as all lowercase: canadaeast
• But when you run azure vm list, the same region is returned in camelCase: CanadaEast
• Older regions (like North Europe) tend to stay consistent as all lowercase (northeurope) across both commands.

Here's a quick example of the output mismatch:

$ azure location list
data: Location : canadaeast
data: DisplayName : Canada East
...

$ azure vm list
data: Location : CanadaEast
data: Name : my-canada-vm
...

Reproduction Steps #

If you want to verify this yourself, follow these steps:

• Deploy a virtual machine in the Canada East region
• Run the command: azure vm list and check the Location field for your VM
• Run the command: azure location list and look for the Location value matching "Canada East" in the DisplayName
• Compare the two values—you'll see the casing difference immediately.

Why This Happens #

From what I've gathered, this boils down to naming standard differences across Azure's internal services and API versions. Newer regions might be registered with camelCase identifiers in some ARM API endpoints, while the location list CLI command pulls data from an older endpoint that enforces all lowercase naming. It's a bit of a legacy vs. new service quirk.

How to Fix It #

The easiest way to avoid issues (especially in automation scripts) is to normalize the casing of region names whenever you use them:

• In Bash scripts, convert to lowercase with:

  region=$(echo "$region_from_vm_list" | tr '[:upper:]' '[:lower:]')
  

• In PowerShell, use the built-in string method:

  $normalizedRegion = $regionFromVmList.ToLower()
  

• If you're working with ARM templates, stick to the all lowercase region names returned by azure location list—ARM generally accepts these without issue.

内容的提问来源于stack exchange，提问作者daniestevez